| name | cis-azure-storage-2.1.1.1 |
| description | Ensure 'Allowed Protocols' for shared access signature (SAS) tokens is set to 'HTTPS Only' |
| category | cis-azure-storage |
| version | 1.0.0 |
| author | cyberstrike-official |
| tags | ["cis","azure","storage","sas","encryption","keys"] |
| cis_id | 2.1.1.1 |
| cis_benchmark | CIS Microsoft Azure Storage Services Benchmark v1.0.0 |
| tech_stack | ["azure"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
2.1.1.1 Ensure 'Allowed Protocols' for shared access signature (SAS) tokens is set to 'HTTPS Only' (Manual)
Description
Shared access signatures (SAS) can be used to grant limited access to Azure Storage resources. When generating a SAS, it is possible to specify the allowed protocols for a request made with the SAS. It is recommended to allow requests over HTTPS only.
Rationale
If a SAS is passed over HTTP and intercepted, an attacker performing a man-in-the-middle attack can read the SAS. Then, they can use that SAS just as the intended user could have. This can potentially compromise sensitive data or allow for data corruption by the malicious user.
Impact
SAS can pose security risks if they are not managed carefully.
Audit Procedure
This is a Common Reference Recommendation. Audit and remediation procedures with full details will be found in the section dedicated to each specific service where this recommendation applies:
- Azure Blob Storage
- Queue Storage
- Storage Accounts > Secrets and Keys
Expected Result
When generating a SAS token, the Allowed protocols field should be set to HTTPS only.
Remediation
This is a Common Reference Recommendation. Audit and remediation procedures with full details will be found in the section dedicated to each specific service where this recommendation applies:
- Azure Blob Storage
- Queue Storage
- Storage Accounts > Secrets and Keys
Default Value
When generating a SAS, the default selection for Allowed protocols is HTTPS only.
References
- https://learn.microsoft.com/en-us/azure/storage/common/storage-sas-overview
- https://learn.microsoft.com/en-us/azure/storage/common/storage-account-keys-manage
Additional Information
This recommendation forms the basis for the recommendations with the same title in the following sections:
- Azure Blob Storage
- Queue Storage
- Storage Accounts > Secrets and Keys
- Storage Explorer
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
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